SB112, 12" offset coupler with a 4" round tube.
SB116 HD with Thru pin. 2 5/16" self latching coupler
Extended Gooseneck Coupler with 16`` Off Set for 4`` round trailer stem
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SB116 16" offset with a 4" round tube, 2 5/16" self latching coupler
SB116XL - 16" offset, 4" round tube OD, XL coupler tube (adds 4" of height)
SB2 9" Offset Square Gooseneck Trailer Coupler
Extended Gooseneck coupler for flat bed truck w/9`` off-set with 4-1/2`` Sq Stem. - SB2XL
SB2-6 6" offset, 4.5" square tube
SB212, 12" offset, 4.5" square tube